---
title: "Shawn P. Callahan, Title 5 System Inspector SI #14623 | Title 5 Roster"
description: "Shawn P. Callahan is a MassDEP-approved Title 5 System Inspector (SI #14623) based in Medford, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/shawn-p-callahan-si14623/
---

# Shawn P. Callahan, Title 5 System Inspector (SI #14623)

Shawn P. Callahan is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #14623
* **Approval expires:** June 30, 2028
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Listed under own name
* **Based in:** Medford, MA
* **County:** Middlesex County

Source: https://neiwpcc.org/wp-content/uploads/2026/10/SI-Instate-10.2.2026.pdf (retrieved 2026-10-12)